What is the best way to pack and ship LPs?

I am interested in selling a portion of my LP collection and would like to know the best way to pack and ship. I've seen mention of special vinyl modes of shipping and so on and am interested how to safely and securely ship these items. I may be offering them in groups of ten or individually.
Lp mailers www.bagsunlimited.com
I have shipped via USPS (the horror, the horror) 150 LPs in super heavy duty booze boxes. Get them at a BIG booze retailer. You might have to go and ask in advance... explain what you want them for and if they are willing, they may save you a bunch. They are good for two cross country trips via USPS before they began to break up. Pack 'em really tight and firm and you are set.
For maximum protection, place the LP and inner sleeve beside the album jacket and place them inside a heavy clear album protector.

Most shippers treat boxes rough and this will prevent the LP splitting the album jacket during transport.
VERY good point, Albert. After learning the hard way, I request that shippers do this with any LP's I order through the mail, because even some seemingly high-volume dealers fail to do so.